enduro2d/samples/bin/library/materials/sprite_material_additive.json

{
    "passes" : [{
        "shader" : "../shaders/sprite_shader.json",
        "state_block" : {
            "blending_state" : {
                "src_factor" : "one",
                "dst_factor" : "one"
            },
            "capabilities_state" : {
                "blending" : true
            }
        }
    }]
}